- Dr René M Müri, Department of Neurology, University of Bern, Inselspital, CH-3010 Bern, Switzerland. Telephone 0041 632 21 11; fax 0041 632 96 79; email
- Received 22 August 1997
- Revised 18 December 1997
- Accepted 5 February 1998
- Published online 1 September 1998.
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